Railroad-cab



D. MATTHEW.

Car Axle Box.

Patented Jan.. 12, 1858;

UNITED STATES PATENT OFFICE.

DAVID MATTHEYV, OF PHILADELPHIA, PENNSYLVANIA.

RAILROAD-GAR BOX.

Specification of Letters Patent No.

To all whom it may concern:

Be it known that I, DAVID MATTHEW, of Philadelphia, county ofPhiladelphia, in the State of Pennsylvania, have invented a new anduseful Improvement in Railroad-Car or Driving-Axle Boxes; and I dohereby declare that the following is a full and exact descriptionthereof, reference being had to the accompanying drawings and to theletters of reference marked thereon.

The nature of my invention consists in a certain improvement in thebearings in journal boxes for the purpose of preventing the horizontalwear, to be hereinafter more fully explained.

To enable others skilled in the art to make and use my invention I shallproceed to describe its construction and operation, reference being hadto the accompanying drawings forming part of this specification, inwhich similar letters in the different figures indicate like parts andin which Figure 1 is a side elevation; Fig. 2, a vertical section at wmFig. 1; Fig. 3, a transverse section at right angles to section Fig. 2.

A is the box, B the hole through which the journal passes, C the oilcellar, D, D, the bearings of brass, (Z the oil cup, E a slot outentirely through the brass and extending the whole thickness of the box.

It is a well known fact that in locomotives, where the horizontal strainis greater than the vertical pressure, the box will wear morehorizontally than in any other direction, or in other words it wearsmore in the direction of the greater pressure. To obviate the injuriouseffects resulting from the wearing of an oblong hole whose greatestdiameter is the horizontal one, I so graduate the bearing surface to thepressure that it shall increase or diminish with corresponding increaseor diminution of pressure, or if there is any disproportion let theirregularity be in favor 19,095, dated January 12 1858'.

of pressure. To do this I cut away the upper portion of the bearingsurfacecutting the metal completely through in both directions. Thedirect effect of this it will be readily seen, is that the bearinginstead of wearing in the direction of the greaterpressure orhorizontally, will wear with the less pressure viz. vertically. Byproportioning the size of the slot E to the degree of downward pressurerelative to the lateral or horizontal, the wear may be made to assumeany direction between the two mentioned. The direction of the wear isshown in Fig. l by the eccentric circles a a a drawn with the centers aa a respectively.

It will be observed that the brasses D reach below the center or line ofcenter of the shaft.

The directions of strain are shown by the red lines at right anglesyyand 2-z Fig. 3.

I am well aware that it is common to use a slot in journal bearings, forpurposes in connection with lubrication, but they have no such effect asmine, and I do not wish to be mistaken as using a mere modification ofsuch a slot or crease, or as claiming any such arrangement or device,but

hat I do claim as my invention and desire to secure by Letters Patent isThe peculiar construction of journal box having a longitudinal slot oropening so proportioned to the relative vertical and horizontal strainsas to produce the results substantially as herein set forth.

In testimony whereof I have hereunto set my hand and seal this fifth dayof November 1857 DAVID MATTHEW. L 8.]

Witnesses WESLEY BRAINERD, CHARLES D. FREEMAN.

